Bug 536164: Extension Point Description not adapted to dark theme

Starting the org.eclipse.sdk.ide application did not correctly set all
colors correctly when displaying the extension point description in
dark theme.

Change-Id: I7554db218b8919e1f184513bcfe258440c3e0f84
diff --git a/platform/org.eclipse.sdk/book.css b/platform/org.eclipse.sdk/book.css
index 56f572b..f8baf55 100644
--- a/platform/org.eclipse.sdk/book.css
+++ b/platform/org.eclipse.sdk/book.css
@@ -124,7 +124,7 @@
 		color:      #f0f0f0; 
 		background: #3d3d3d;
 	} 
-	body, h1, h2, h3, h4, h5, h6, caption, p, 
+	body, h1, h2, h3, h4, h5, h6, h6.CaptionFigColumn, caption, p, 
 	table, td,  th, ul, ol, dl, li, dd, dt, pre {
 		color: #f0f0f0;
 	}